func (s *StaticTable) initialize(schema *Schema) error {
s.Schema = schema
s.wg = new(sync.WaitGroup)
// Load dimension tables
for i, col := range schema.DimensionColumns {
if !col.String {
continue
}
if err := s.DimensionTables[i].Load(schema, i); err != nil {
return err
}
}
// Load each interval/segment
for _, interval := range s.Intervals {
interval.Segments = make([]*Segment, interval.NumSegments)
for i := 0; i < interval.NumSegments; i++ {
f, err := os.Open(interval.SegmentFilename(schema, i))
if err != nil {
return err
}
mapped, err := mmap.Map(f, mmap.RDONLY, 0)
if err != nil {
return err
}
interval.Segments[i] = &Segment{File: f, Bytes: mapped}
}
}
return nil
}
// freeze opens segment files as readonly mmaps and returns an immutable *Interval. iv should not be used
// after calling freeze.
func (iv *writeOnlyInterval) freeze(s *Schema) (*Interval, error) {
if err := iv.closeCurrentSegment(); err != nil {
return nil, err
}
iv.Segments = make([]*Segment, iv.NumSegments)
for i := 0; i < iv.NumSegments; i++ {
if !iv.DiskBacked {
iv.Segments[i] = &Segment{Bytes: iv.buffers[i].Bytes()}
continue
}
filename := iv.SegmentFilename(s, i)
f, err := os.Open(filename)
if err != nil {
return nil, err
}
mapped, err := mmap.Map(f, mmap.RDONLY, 0)
if err != nil {
return nil, err
}
iv.Segments[i] = &Segment{File: f, Bytes: mapped}
}
return &iv.Interval, nil
}